1 files changed, 29 insertions, 0 deletions
diff --git a/zap/source/any/str/utf8declen.c b/zap/source/any/str/utf8declen.c
new file mode 100644
index 0000000..f8b7ae8
--- /dev/null
+++ b/zap/source/any/str/utf8declen.c
@@ -0,0 +1,29 @@
+/*
+	Copyright 2022-2023 Gabriel Jensen.
+	This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+	If a copy of the MPL was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0>.
+*/
+
+#include <zap/str.h>
+
+zap_sz zap_utf8declen(zap_i8 const * buf) {
+	zap_sz len = 0x0u;
+	for (;;++len) {
+		zap_i8 const oct = *buf;
+		if (oct == 0x0u) break;
+		if (oct >= 0xF0u) {
+			buf += 0x4u;
+			continue;
+		}
+		if (oct >= 0xE0u) {
+			buf += 0x3u;
+			continue;
+		}
+		if (oct >= 0xC0u) {
+			buf += 0x2u;
+			continue;
+		}
+		++buf;
+	}
+	return len;
+}